Playing around with a Numitron tube, driving the filaments from a uP outputs.
Here's the relevant data:
Most lamp driver IC datasheets recommend a filament pre-warm resistor to reduce "thermal shock." But these tubes are common anode and are driven by pulling the cathodes low. Is there a way to implement in this configuration?
Second question: I'm driving the anode with an eBay special 0.5- something volt input to volt to 5 volt boost converter from a LiPo battery. This module has a "shutdown" pin which will, obviously, shut the converter down when pulled low.
Would it be possible to implement PWM dimming of all segments by driving the converter shutdown pin from a uP output?